OK? But we’re not calling archery bows and violin bows circular; we’re calling them bows i.e. curved. And we’re calling the rainbow a bow, i.e. curved, which it is. Curved does not imply circular, but circular does imply curved.
Besides, I don’t think the proto-indo-europeans were out there with calipers measuring the precise curvature of objects they decided to label with the *bheug- root.
A violin bow is made from a curved piece of wood, the same as the weapon.
Yes, but curved does not mean circular. Do either bows have constant curvature?
OK? But we’re not calling archery bows and violin bows circular; we’re calling them bows i.e. curved. And we’re calling the rainbow a bow, i.e. curved, which it is. Curved does not imply circular, but circular does imply curved.
Besides, I don’t think the proto-indo-europeans were out there with calipers measuring the precise curvature of objects they decided to label with the *bheug- root.